Comparator



May 12, 1931.

P. E. KLOPSTEG 1,804,421

COMPARATOR Filed May 11-, 1 29 2 Sheets-Sheet l- )QMW a Qw- May 12, 1931. KLQPSTEG 1,804,421

COMPARATOR Filed May 11, 1 29 2 Sheets-Sheet 2 A [ll Fatal. K201295269 Patented May 12, 1931 urirr 'rArs ATET OFFICE PAUL E. KLOPSTEG, OF CHICAGO, ILLINOIS, ASSIGNOR TC CENTRAL SCIENTIFIC COM- A CORPORATION OF ILLINQIS I COMPARATOR Application fiIedMay 11, 1929. Serial No. 332,344.

This invention relates to comparators and has for its principal object to provide a simple and hardy structure for making; accurate measurements.

Further objects and advantages of the invention will become apparent as the disclosure proceeds and the description is read in connection with the. accompanying drawings, in which Figs. 1, 2 and 3, are, respectively, front and side elevations and plan view of the preferred embodiment of the invention equlpped with a finger pointer;

'Figs. 4 and 5 are, respectively, front ele- E vation and plan view of the same embodiment equipped with a telescope;

Fig. .6 is a plan view of the device shown in Figs. 1, 2 and 3, mounted for making horizontal measurements; 7 L

Fig. 7 is a vertical section taken on the line 7'? of Fig. 6;

, Fig. 8 is a sideelevation of the device shown in Fig. 6, equipped with a telescope;

Fig. 9 is-a vertical section taken on the line 1 99 of Fig. 2, with the intermediate portion broken away; 1 i

I Fig. 10 is-a front elevatlon of the lntermediate. portion of the device showing the carriage in detail, and

.39 Fig. 11 is a transverse section taken on the line 11'11' of Fig. 10. v But this specific illustration and the correspondingly specific description are used for the purpose of disclosure only, and it is reahzed that the subject of the invention may be embodied in other forms and put to other uses, allof which are intended to be covered by the appended claims.

Generally. speaking, the device comprises a graduated pillar 1O swiveled in a tripod base 11 and equipped with a travellng carriage 12, carrying a. Vernier 13, anda'finger pointer 14. or a telescope 15. 7

Referring to Fig. 9 it wlll be seen that the pillar includes a tube 16 of brass substantially square in cross section, and havlng slots 17 and 18 in one side wall thereof. The bottom of the tube 16 is soldered, or otherwise secured to a block 19 having a slot 2( 1n its 59 upper. portion, corresponding in position to the slot 18, and being reduced at 21, where it is received in the bore 22 of the tripod 11, and yieldingly held by the friction of the resilient disk 23 clamped to the lower endiof the block and against the bottom of the-tri- 5 pool by a screw 24 and-washer 2 5.

' The upper end of the tube 16 is equipped with an adjustable block 26 having its lower portion slotted at 27 to correspond with the slot 17 and having its upper portion 28 reduced and threaded to pass through the cap 29 and receive the nut 30, by which its position may be varied to adjust the tension on the cable device.

Cable pulleys 31 and 32 are journaled on Shafts 33 and 34 in the blocks 19 and 26, and project through the slots 17 and 18, as best illustrated in Fig. 9.

The carriage, generally indicated at 12, includes a tubular sleeve of brass 35 wtele- '1 scoping with the tube 16, and cut away at 36 to permit the vernier 13 to be mounted close to the scale 37, and make the adjacent portion of the scale visible.

A wire cable 38 running over the pulleys 31 and 32, has its ends provided with eyes 39, which arefastened to the sleeve 35 by screws 40 and washers41.

A bracket 42 is fastened to the sleeve 35 by screws 43 and has three bores 44, 45 and 46, each of which is at right-angles-to and communicates with the other two. The bore 44 is especially intended to receive the rounded shank 47 of a bar 48 (Figs. 4 and 5) equipped. with V-blocks 49 adapted to receive the telescope15, which is yieldingly held in place by aspring 50; shaped substantially like a sWansn-eck, and fastened to the bar by a screw 51.

The bore 45 is especially provided to receive the shank 52 which carries the pivoted finger pointer 14. 3

And the bore 46 is threaded to receive'a set screw 53 by whichthe shanks 47 and 52 may be clamped in'any selected position.

The shaft 34 projects from the block 19 through the tube 16 and is provided with the knurled knob 54 2), by which the shaft and pulley 32 may be rotated to propel the carriage 12 along the pillar.

The cable 38 is provided with a lead cylinder 55 to act as a counter-weight for the carriage thereby permitting it to be moved readily, or to stand in adjusted position.

When the device is to be used in horizontal position, as illustrated in Figs. 6 and 8, the end opposite the tripod is held by a separate support (Fig. 7) comprising a frust0- conical base 56 having a threaded neck 57 receiving a level screw 58 having a point 59 adapted to be received in a recess. 60 ad jacent to the corresponding end of the pillar 10. The screw 58 is provided with a knurled collar 61 by which it may be readily adj ust-ed to level the pillar.

By turning the nut 30 the tension of the cable 38 may be corrected in order to eliminate inaccuracies due to slack.

For vertical measurements the pillar is set upright on the tripod 11, the finger pointer 14, or the telescope pointer 15, is mounted in the carriage; the latter is first adjusted to bring the end of the pointer, or the cross hair in the telescope, in register with one of the points between which the distance is to be measured; the reading of the main and vernier scale is noted; the carriage is then shifted to the other point and the reading again noted, when simple subtraction gives the actual measurement. 7

For horizontal measurements the device is set up, as indicated in Figs. 6 and 8, and operated in a similar way.

Swiveling the pillar to the tripod facilities directing either'the pointer or the telescope, and adds to the general convenience with which the measurements can be made by the use of this device.

I claim as my invention:

1. In a device of the class described, a hollow pillar having a scale thereon, a carriage slidable along the pillar and having a vernier scale thereon cooperable with the scale on said pillar, a pulley located adjacent either end of the scale and j ournaled in said pillar, a cable running over the pulleys and connected with the carriage, and a hand wheel for driving one of the pulleys.

2. In a device of the class described, a hollow pillar having a scale upon the face thereof and a slot adjacent to each end, a block fitted in each end of the pillar, and having a slot aligned with the corresponding slot in the pillar providing clearance for pulleys, a pulley ournaled in each block, a cable running over the pulleys, and a carriage on the pillar connected with the cable.

3. In a device of the class described, a pillar having a scale upon the face thereof, a carriage provided with an index readable in cooperation with said scalc mounted to travel along the pillar and having two bores at right angles to one another to receive supports for pointers.

4. In a device of the class described, a base,

5. In a device of the class described, a pillar I provided with a scale on the face thereof, a pulley carried by one end of said pillar and adjustable with respect thereto, a second pulley journaled to said pillar adjacent the other end thereof, a cable looped about each of said pulleys and running over them and a carriage bearing an index cooperable with said scale slidably mounted upon the pillar and connected with said cable and adapted to be propelled thereby. 1

6. In a device of the clam described, a pillar bearing a scale upon its face, a pulley journaled to said pillar adjacent each end thereof, a cable looped about each of the pulleys and running over them, a carriage slidably mounted on said pillar and provided with a vernier cooperating with the scale on the pillar, said carriage being made fast to the cable, and a counterweight connected to the cable to counterbalance the weight of the carriage.

7. In a device of the class described, a pillar provided with a scale upon the face thereof, a pulley mounted upon the pillar adjacent to each end thereof, a cable looped about each of the pulleys and running over them, a carriage attached to the cable upon the pillar and supporting an indicating instrument adapted to be propelled by the cable, and means for adjusting one of said pulleysto tension the cable.

8. In a device of the class described, a pillar bearing a scale upon the face thereof, a pulley nally with respect thereto, a cable looped about each of the pulleys and running over them, a carriage on the pillar connected to the cable and adapted to be propelled thereby, and a base to which the pillar is swiveled.

10. In a comparator device, a base, a pillar having a scale thereon and extending from the base and swiveled therein, pulleys journaled on the pillar adjacent each end thereof, a cable looped about the pulleys, a carriage slidably mounted upon the pillar and attached to the cable, a counterweight carried by the cable and located Within the pillar, an index upon said carriage cooperating with the scale on said pillar, and a telescope mounted upon the carriageat right angles to the pillar.

11. In a comparator, a base, a pillar extending from the base and swiveled therein, a support for the other end of said pillar provided with levelling means, a scale upon the pillar, pulleys journaled on the pillar adjacent either end thereof, a cable looped about the pulleys, a carriage slidably mounted upon the pillar and attached to the cable, a hand Wheel for rotating one of said pulleys, an index upon the carriage cooperating with the scale upon the pillar, and a telescope mounted upon the carriage at right angles to the pillar. v

In testimony whereof I affix my signature.

PAUL E. KLOPSTEG.

cERTmoATE GE ooRREonoN.

Patent No. 1,804,421. Granted May 12, 1931, :0

PAUL E. KLUPSTEG.

t is hereby oortified that error appears in the printed specification: of the above numbered giatent requiring correction as ioiiows: Page 2, line 107, claim 8, after the word "pulley" insert the Word journaled; and that the said Letters Patent shouid be read with this correction therein that tho same may conform to the record of the case in the Patent (mice.

Signed and sealed this 7th day of July, A. D. 1931.

M. J. Moore, (Seal) Acting fiommissioner of Patents. 

